Apparatus for extruding caps



Aug. 27, 1929. F. J. LYNCH APPARATUS FOR EXTRUDING GAPS Filed March 29, 19 28 ATTORNEY WITNESSES Patented Aug. 27,1929.

UNITED STATES? PATENT oi-"rice,

FRANK 3'.

taxes, or HILLSIDE, NEW JERSEY, Assmnoa '120 THE son runnooar'om- TION, OF HILLSIDE, NEW JERSEY, A CORPORATION OF NEW. JERSEY.

APPARATUS FOR EXTBUDING GAPS.

Application filed Iarch 29, 1928. Serial 1T0. 265,687.

Another object of the invention is to pro vide an improved die and also improved method of operation for not only forming the cap but for ejecting the same after having been formed. i In the accompanying drawings- Figure 1 is a longitudinal yertlcal sectional view through a pair of dies and associated parts disclosing how a cap may be formed;

Figure 2is a'view similar to Figure 1 showing the parts separated with the cap ejected;

Figure ished cap.

Referring to the accompanying drawing by numerals, 1 and 2 indicate dies, die 1 being preferably stationary and die 2 preferably movable. These dies may be operated either vertically or horizontally, but as shown in the drawing they are operated hOIlzontally. When a cap is to be formed a slug of the so desired size is placed in the cavity 3 of die 2 by any desired means, and the plunger 4: moves down to the position shown in Figure 1. Die 2 with its slug is then forced against die 1 and the slug will be extruded until it 20 3 is a perspective view of the finassumes the position shown in Figure 1. It

will be noted that die 2 is provided with an annular portion 5 adapted to fit into the annular recess 6, while annular projection 7 of die 1 fits into the socket 3. Plunger 1 is provided with a shoulder 8 and with a threaded extension 9 of the same size as the threaded neck of the tube on which the cap is to be eventually mounted. The walls of socket 1 are preferably milled, so that when the cap has been completed, a milled surface 10 will be presented, as shown in Figure 3. This milled surface is on the flange 11 which merges into the top 12 of the cap which in turn merges into the internally-threaded 5 body 13. By forming the cap in this manner the seam or finishing edge, if any, will be at the point 14. After the dies have come together and extruded or formed the cap, as shown in Figure 1, die 2 is backed off to substantially the position shown in Figure 2, and in backing ofi' moves out of contact with the milled surface 10. This may be readily done, as the threaded portion of plunger 4 holds the cap firmly in place. After die 2 has been backed off plunger 4 is rotated so as to be unscrewed from the cap and the cap is at that time then held only by the friction of the body 13 against die 1, so thatan ejecting plunger'15 may readily strike the cap and move the same to the position shown in Figure 2. After the ejecting plunger 15 has been withdrawn the cap Wlll drop by gravity to a desired point, and

the operation may be repeated. It is to be noted that :the. wall 16 is slightly tapering, so that the inner wall 17 on the cap will be tapering. This reduces the friction to a great extent, and as the outer part of the flange 11 is free, it will require but a small amount of power to push the cap out of engagement with die 1. By reason of this fact the top 12 ma be made comparatively thin throughout.

he flange 11' may also be made comparatively thin, thus presenting an efiicient and desirable cap with a minimum material. Extra thickness in the top 12 has heretofore been necessary by reason of the ower required to eject the finished cap but by the construction of the dies in the method usedherein, this extra thickness is eliminated,,as the friction is reduced to a minimum and consequently the cap may be ejected with small efi'ort.

What I claim is v 1. A cap forming apparatus, including a pair of dies, one die being formed with a centrally-disposed recess and an annular ring portion and the other die being formed with a central bore extending through the die, an annular recess for receivin said ring, and a projecting ring adapted to t into said recess, said recess being formed with milled walls, whereby when the dies come together for forming a cap the outer edge of'the cap will be milled, and when the dies are sepa- 100 rated the outer surfaces of the cap, except the body, will be out of contact with the dies and a shaft rotatably fitted into said bore, said shaft having a threaded portion at' the end thereof of less diameter than the 5 bore, whereby when the dies come together a space will be provided for the body of the cap when formed.

2. An apparatus for forming by extrusion an internally-threaded cap having a top 110 eluding a merging into a flange, said apparatus inpair of co-acting dies and a plunger having a threaded end portion, said plunger being fitted into one of said dies when in opposite position, the die carrying the plunger having a bore for receiving the plunger and an annular groove surrounding the bore at one end thereof, said groove being spaced from the bore, whereby an ejecting ring will be presented, said rmg on its outer surface being tapering, the otherof said dies being formed with a socket having a ring around the socket, said ring fitting into said annular groove 1 'but slightly spaced from said ring,- wherebywhen a slug is in said recess and said dies are brought together, the slug Will bev extruded so as to surround the threaded part of said plunger and surround on three sides the ring formed on the die having the bore.

3. A structure for forming by extrusion an internally-threaded cap having 'a tubular body, a top therefor and a depending flange exending from the top and surrounding the body, said structure including a stationary die, a movable die and a plunger,

. therefrom, whereby said stationary die having a bore extending therethrough and an annular recess surrounding the bore at one end but spaced a forming ring is provided around said bore, said plunger being positioned at said bore formed with a reduced threaded end extending to a point flush with the side surface of said ring, and the movable die being formed With a socket of slightly greater diameter and depth than said ring, the end of said lnovable die fitting into the said annular recess when in an operated position, whereby when a slug is placed in said recess and the movable die is moved to an operated position in respect to the stationary die, the slug will be extruded for forming a tubular body around said reduced threaded section, a radiating top extending over the side surface of said ring and a flange extending over the periphery of the rim.

S igned at Hillside in the county of Union and State of New Jersey this 21st day of March, A. D. 1928.

FRANK J. LYN OH. 

